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The condensation of zinc oxide nano clusters produced in gas phase has beenevidenced in the ablation of a ZnO solid target by a pulsed ArF laser. Wecompare the spatio-temporal evolution of the shape of ZnO ablated plasma plume,both in vacuum and in controlled gas environments (Helium and/or Oxygen) frommonitoring with CCD camera and from spectroscopic studies. The expansion of theplasma plume and the growth of the nanoclusters depend strongly upon thecollisions between the ablated particles and surrounding gas molecules, as wellas on the chemical reactions in the case of oxygen. The spectra of the observedplasma emittion are mainly due to atomic transitions in the neutral Zn. We havealso observed the photoluminescence of the nanoclusters suspended in the gasand their decomposition in the beam of ArF laser.Comment: In Frenc

Ablation de ZnO par laser UV (193 nm) : nano-agrégats en phase gazeuse